Roll slitting and rewinding machines



y 1963 K. RODER ROLL SLITTING AND REWINDING MACHINES 2 Sheets-Sheet 1Filed April 6, 1960 INVENTOR /7//7EL FODE/Z 46:35: CQNEYS May 21, 1963K. RGDER 3,090,576

ROLL SLI'I'TING AND REWINDING MACHINES Filed April 6, 1960 2Sheets-Sheet IN VE NTOR 9 R 2 ZN Q Q 0 ffAKL B05055 By P [/4 MN m ifATTORNEYs United States Patent 3 ($0,576 ROLL SLITTING ANl EEWENDINGMACI HNES Karl Riider, Darmstarlt-Eherstadt, Germany, assignor t0Maschinenfabrik Goehel G.m.h.H., Darmstadt, German y Filed Apr. 6,19619, Ser. No. 20,317 Claims priority, application Germany Apr. 9, 19594 Claims. (Cl. 24267.1)

The invention relates to roll slitting and rewinding machines for paper,plastic or the like sheets incorporating a slitting or feed rollerassembly and a rewinding shaft lo cated underneath the assembly inmovable bearings to travel downwards as the diameter of the rewindingroll increases. In such machines to press the rewinding roll against thesaid feed roller by means of a weight or spring system or a hydraulicarrangement pressing the rewinding shaft or the supporting rollerassembly upwards have certain drawbacks. If a counterweight is usedwhich acts with a constant force, the pressure between the rewindingroll and the feed roller will decrease during the operation to the samedegree as the rewinding roll increases in weight. In many cases, thedecrease may go so far as to eliminate this pressure completely. Thismethod is not applicable because the roll will become too soft on itsoutside.

In machines having a hydraulic pressure arrangement connected with thesupporting rollers, the pressure is controlled by transmitting themovement of the supporting rollers over a cam to a contact pressuregauge which provides for a constant increase of the hydraulic pressure.The necessary control and operating means in such arrangements are verycomplicated and will be used for very large machines only. Moreover, thecam disk must be exchanged for different operating conditions.

Roll slitting machines of the type in which the pressure between therewinding roll and the feed roller is caused by springs, require asubstantial number of long and strong springs to ensure the necessaryamount of pressure. If any of the operating conditions, say, thepressure, are altered, the springs must be changed, additional springsmounted or part of the springs removed. This is often undesirable.

This invention eliminates the drawbacks of known rnachines and an objectof the invention is to provide for an easy control and change of thepressure between the rewinding roll and the feed roller which isobtained by having a pivoting or otherwise movable means follow theoutside diameter of the roll, its movement being used to control thedownward travel of the rewinding shaft. A further object therefore toachieve the foregoing is to make a riding or weight roller part of thepivoting or otherwise movable means whereby its pressure is adjustableby a weight connected thereto, for instance a sliding weight.

The downward travel of the rewinding shaft may be accomplished, forinstance, by using an auxiliary motor which is switched on and off bythe controlling means and drives a self-locking gear mechanism which isconnected to the rewinding shaft by ropes, chains or rods. One means toswitch the motor on and off is to have the controlling means operate acontact in its extreme position.

A still further object of the invention resides in the rewinding shaftto be supported, for instance, by hydraulic means with either end of theshaft being placed on a piston rod of each one of the hydrauliccylinders. Thereby the pressure on the liquid results from the pressureof the riding roller against the rewinding roll, with the pressure beingproduced, for instance, by a sliding weight. In this assembly, therewinding shaft is lowered when a lever carrying the sliding weight andacting as the con- 3,099,576 Patented May 21, 1963 trolling means, iscaused, in its extreme position, to open a valve for a number of shortintervals so that a small portion of the liquid may flow from thecylinders.

Further objects will be apparent from the following description whenconsidered in connection with the accompanying drawings in which;

FIG. 1 is a side elevation of a machine according to the invention inwhich the rewinding shaft is carried by cables and with a front sideframe omitted,

FIG. 2 is an end view of the machine of FIG. 1 as viewed in thedirection of the arrow,

FIG. 2A is a partial section showing a detail of the bearing assembly,

FIG. 3 is a side elevation of a modified machine in which a pair ofsupporting rollers are suspended by cables and with a front side frameomitted,

FIG. 4 is an end view of the machine of FIG. 3 as viewed in thedirection of the arrow,

FIG. 5 is a side elevation of a detail of a bearing assembly of thesupporting rollers of FIGS. 3 and 4, and

FIG. 6 is a top plan view with parts omitted, showing theweight-actuated pressure roller.

In FIG. 1 the unwinding shaft, not shown, is mounted in the two sideframes 1. The web 2 of paper is fed from the unwinding unit over orunder guide rollers 3 and 4 to the lower knife roller 5 and runs aroundthe latter. The pivoting upper knives 6 engage into the lower knives ofroller 5 to slit the web 2 into strips as desired. The strips runagainst a roller 7 to a riding or pressure roller 8 which rolls directlyon the rewinding roll 9. As a drive means for the roll 9, Patent No.2,158,286 of May 16, 1939, shows a drive for the windup roll in FIG. 6,and is described on page 3 in lines 16 to 23 where the Winding shaft isreferred to.

The rewinding shaft 10 is carried by both ends in slide bearings 11which move vertically in guides 12 of the two frames 1. Both slidebearings 11 are suspended by ropes, cables, or chains 13 connected at 35and each of which passes over a stationary rotatable pulley 14 and isconnected to a pulley or drum 15. When the pulleys 15 which are keyed ona shaft 16 rotate, the two slide bearings 11 travel upwards or downwardsby an equal amount in accordance with the direction of rotation of thepulleys 15.

The riding or pressure roller 8 is carried on both ends in levers 33 and34. The levers are both attached to a shaft 18 which pivots on both endsin brackets 17. A lever 19 with a sliding weight 20 is secured to thesame shaft 18, and this results in that the pressure of the ridingroller 8 against the rewinding roll 9 is determined only by the weight,that is the position of the sliding weight 20 on its lever 19. A desiredpressure is therefore obtained by adjusting the position of the weight20, and a scale may be provided to read the pressure of the weight.

In the arrangement described, the shaft of the riding roller 8 willgenerally be parallel with the rewinding shaft 10. Under certainconditions it is sometimes desirable to permit an angular adjustment ofthe riding roller with respect to the rewinding shaft, and in that case,it should be possible at least, on one side of the machine, tomake anadjustment, for instance by means of a screw thread between the bearingof the riding roller and its lever secured to the shaft 18.

Before starting the machine, the ropes or cables 13 should be raised upby turning the pulleys 15 until the rewinding shaft 10 completely ornearly contacts the riding or weighted roller 8. The lever 19 of thesliding weight is then in its lowest position which may be determined bya stop 21. When the rewinding shaft 10* with the web secured thereto isdriven, the weight lever 19 will lift from the stop 21 and provide theadjusted pressure between the riding roller 8 and the outside diameterof the roll being started. As the roll increases in size, the lever 19is lifted to 7 an increasing extent without, however, changing theeifective'pressure, and the one end of the lever 19 thereby abutsagainst a contact pin of the switch 22 to thus close a circuit. Thiscircuit is the one in which the auxiliary motor 23 is connected which isnow started and turns a worm gear 24, which meshes with a worm wheel 25which also turns although at a considerably low- .er speed. The wormwheel 25 is fixed on the shaft 16 so that the two pulleys will turntogether with the worm wheel, the direction of rotation being such thatthe two slide bearings 11, which are continuously under a force, willtravel slowly downwards when the auxiliary motor 23 starts to turn. As aconsequence, the rewinding shaft 10, the rewinding roll 9, the ridingroller 8, and the lever 19 following it will also move down in order torelease the pin of the switch 22 and thus stop the auxiliary motor 23.This prevents any further downward movement of the two slide bearings 11and since this cycle is completed within a very short time, there isonly a slight movement of the slide bearings. When the winding shaft 10is rotated then the web 2 will be wound on the rewind roll 9, and thusthe diameter of this roll will increase. Since the bearings for thewinding roll are stationary, the increasing diameter of the roll willpress against the weighted roller 8, and this roller will be lifted,which will in turn lift the arm 19 to close a. contact to thus operatethe motor to lower the rewind roll, since the weighted lever 19 ispivoted at 18 and thus will cooperate with the contact at the free endof the lever. This latter will result in the motor 23 being energized,and thus the bearings and the shaft 10 will be lowered and ad jus'ted toits proper position.

When the slide bearings 11 have come to rest, the continuously rewindingroll 9 again causes the lever 19 to lift and the cycle begins once more.'Throughout the winding operation the lever 19 is operated to cause ashort lowering of the rewinding shaft each time until the final diameterof the roll 9 is reached. Since the pressure exerted on the ridingroller 8 by the weight 20 is practically uninfluenced by the movementsof the lever 19, there is no change in pressure during the completewinding operation, provided the weight 20 remains in its position.

If it is desired to change the pressure during the operation, which isoften the case, it sufiices to adjust the weight 20 along the lever 19.This may be made manual ly or alternatively, by automatic means. By thisarrangement it is possible to wind under considerable tension in thebeginning with less tension on the outside of the roll which conditionis often desired. When the weight lever 19 is designed as shown in thedrawing, the weight 20 will always cause the weighted roller 8 to pressdownwards. In some cases it maybe desirable to eliminate the pressure orforce towards the end of the. winding operation, and this may beaccomplished by extending the lever 19 to the left, FiG. 1, beyond itspivoting shaft 18 so that the weight 20 may be displaced at least untilits center of gravity is in the vertical plane passing through the shaft18.

In FIGS. 3 to 5 the winding roll is not supported by i the rewindingshaft as in FIG. 1, but rests on supporting rollers 26 and 27 with slidebearings 11 movable in the slots 12. These latter each are carried onboth ends in a cross-bar 28 attached to a slide block 29. Both slideblocks 29 are arranged within the slot 12' as guides which are providedin the two frames 1'. These slots 12 are longer than the slots 12 ofFIG. 1. The slide blocks 29 are each fitted with a bracket or brackets30 to which the ropes or cables 31 are secured. The ropes 31 on bothsides of the machine each pass over a pulley 32 in the upper part of themachine and secured to a pulley '15 which is driven by the auxiliarymotor 23 over a Worm gear 24', similar to the pulleys 15 in FIG. 1. Theriding or weight'roller 8' is supported in hearings in the lever arms33' and 34' which are mounted to swing on a shaft i- 18'. The shaft 18is mounted in brackets 17', FIG. 3 mounted on the frame 1'.

The operation of this machine of FIGS. 3 to 5 is the same as describedfor the operation of the machine of FIG. 1. Before the winding operationstarts, the rewinding shaft 19 is placed between the two supportingrollers 2 6 and 27. When the auxiliary motor 23 is driven, it pulls theropes 31 upwards, until the rewinding shaft with the web pasted theretotouches the riding roller 8. Then the rewinding shaft 10 or thesupporting rollers 2-6 and 27 or both are driven. As the rewinding rollincreases in size, it lifts the lever 19 and operates the contact 22'causing the motor 23 to slightly lower the supporting rollers 26 and 27suspended by the cables 31. This movement comes to an end as soon as thecontact 2 2 is released. The cycle is frequently repeated during thewinding operation until the rewinding roll 9' has reached its desireddiameter.

1 claim as my invention:

1. A roll rewinding machine for paper, plastic and other webs comprisinga frame, a rewinding roll for the strips of web and mounted on a shaft,a pair of slide bearings slidably mounted in guides in the frame and inwhich the shaft is mounted, pulleys in the frame and having meansconnected to the hearings to raise or lower the rewinding roll, andmeans operative by contact with the winding roll to operate the pulleysdependent upon the amount of web wound on the rewinding roll to adjustthe position of the hearings in the frame.

2. A roll rewinding machine for paper and like webs comprising a frame,a movable pair of bearings vertically slidable in the frame, a shaftmounted in the bearings, said shaft being adapted to receive the webafter being cut into strips, means for raising and lowering the bearingsdependent upon the change in the circumferential size of the strips onthe shaft, and a weighted roller to roll on the circumferential stripsof the web controlling the operation of the last mentioned means toadjust the hearings to accommodate the changing size of the roll ofstrips.

3. A roll winding machine for cut paper strips and like webs comprisinga frame, means for supporting a roll of out strips wound on the rollafter being cut, means controlled by means in contact with the outerperiphery of the roll to lower the latter in the frame as the diameterof the roll increases by the winding of the cut strips of paper thereon,and amotor mounted on the frame to operate the means to lower the roll.

4. A roll rewinding machine for paper, plastic and other webs comprisinga frame, a plurality of guide rollers mounted in the frame to guide theweb, a rewinding roll for the web mounted on a shaft, 21 pair of slidebearings slidably mounted in guides in the frame and in which the shaftis mounted, pulleys in the frame and having means connected to thehearings to raise or lower the rewinding roll, means including aplurality of levers, pivot means for said levers for pivoting saidlevers in the frame, said levers having a riding roller thereon forcontact with the rewinding roll, a further lever pivoted on said pivotmeans and an adjustable weight slidable on said further lever for urgingsaid riding roller into engagement with said rewinding roll, said ridingroller being operative by contact with the winding roll to control thepulleys dependent upon the amount of web wound on the rewinding roll toadjust the position of the bearings in the frame.

References (Iited in the file of this patent UNITED STATES PATENTS1,680,979 Gardner Aug. 14, 1928 2,158,286 Kohler May 16, 1939 2,360,564Johnstone Oct. 17, 1944 2,733,019 Goodwillie Ian. 31, 1956 FOREIGNPATENTS 863,596 Germany Jan. 19, 1953

1. A ROLL REWINDING MACHINE FOR PAPER, PLASTIC AND OTHER WEBS COMPRISINGA FRAME, A REWINDING ROLL FOR THE STRIPS OF WEB AND MOUNTED ON A SHAFT,A PAIR OF SLIDE BEARINGS SLIDABLY MOUNTED IN GUIDES IN THE FRAME AND INWHICH THE SHAFT IS MOUNTED, PULLEYS IN THE FRAME AND HAVING MEANSCONNECTED TO THE BEARINGS TO RAISE OR LOWER THE REWINDING ROLL, ANDMEANS OPERATIVELY BY CONTACT WITH THE WINDING ROLL TO OPERATE THEPULLEYS DEPENDENT UPON THE AMOUNT OF WEB WOUND ON THE REWINDING ROLL TOADJUST THE POSITION OF THE BEARINGS IN THE FRAME.